my dell inspiron 18000 not working.

Hi friends,
I have strange problem my laptop (dell inspiron 18000) not working.
when i power on, it's LED on for a 2-seconds then off suddenlly no display. at on time motherboard 5v,12v & -12v lines are normal.
I have swap following parts,
1. Adapter.
2. Battery.
3. converter ckt(small ckt near battery).
4. cpu.
5. ram.
I know that the problem might be shorting in m/b, but where i dont know.
can u give me hint or cause???

Hi friends,
I have strange problem my laptop (dell inspiron 18000) not working.
when i power on, it's LED on for a 2-seconds then off suddenlly no display. at on time motherboard 5v,12v & -12v lines are normal.
I have swap following parts,
1. Adapter.
2. Battery.
3. converter ckt(small ckt near battery).
4. cpu.
5. ram.
I know that the problem might be shorting in m/b, but where i dont know.
can u give me hint or cause???

have u checked to install the operating system.try to install the operating system.or re-arrange the RAM.then try